WinHttpReceiveResponse function return an error - c++

Question

Can someone tell me what is wrong in the code below?
void Mess(LPCWSTR Str)
{
MessageBox(0, Str, L"Hi", 0);
}
int main()
{
// HttpOpen
HINTERNET hHttp = NULL;
LPCWSTR lpcwAgent = L"UserAgent";
DWORD dwAccessType = WINHTTP_ACCESS_TYPE_NO_PROXY;
LPCWSTR lpcwProxyName = WINHTTP_NO_PROXY_NAME;
LPCWSTR lpcwProxyByPass = WINHTTP_NO_PROXY_BYPASS;
DWORD dwFlag = 0;
// HttpConnect
HINTERNET hConnect = NULL;
LPCWSTR lpcwServerName = L"localhost";
INTERNET_PORT Port = INTERNET_DEFAULT_HTTP_PORT;
DWORD dwReserved = 0; //must be 0
// HttpOpenRequest
HINTERNET hRequest = NULL;
LPCWSTR lpcwVerb = L"GET"; // or POST, PUT
LPCWSTR lpcwObjectName = L"/index.php";
LPCWSTR lpcwVersion = NULL; //NULL == HTTP/1.1
LPCWSTR lpcwReferrer = WINHTTP_NO_REFERER; // It mean there's no referrer
LPCWSTR* plpcwAccept = WINHTTP_DEFAULT_ACCEPT_TYPES; // For more information: Media types (http://www.iana.org/assi gnments/medi a-types)
DWORD dwRequestFlag = 0;
// HttpSendRequest
bool bSendRequest = false;
LPCWSTR lpcwHeaders = WINHTTP_NO_ADDITIONAL_HEADERS; // Additional headers to append to the request
DWORD dwHeaderLength = 0;
LPVOID lpvOptional = WINHTTP_NO_REQUEST_DATA; //The data which is used for POST or PUT
DWORD dwOptionalLength = 0;
DWORD dwTotalLength = 0;
DWORD_PTR pdwContext = NULL;
// HttpReceiveResponse
bool bReceiveResponse = false;
HINTERNET _hRequest = NULL; // Will be set again after HttpOpenRequest are completed
LPVOID lpvReserved = NULL;
hHttp = WinHttpOpen(lpcwAgent, dwAccessType, lpcwProxyName, lpcwProxyByPass, dwFlag);
if ( hHttp == NULL )
{
Mess(L"Unable to open a connection");
}
else
{
hConnect = WinHttpConnect(hHttp, lpcwServerName, Port, dwReserved);
if ( hConnect == NULL )
{
Mess(L"Unable to Connecting");
}
else
{
hRequest = WinHttpOpenRequest(hConnect, lpcwVerb, lpcwObjectName, lpcwVersion, lpcwReferrer, plpcwAccept, dwRequestFlag);
if ( hRequest == NULL )
{
Mess(L"Unable to open the request");
}
else
{
bSendRequest = WinHttpSendRequest(hRequest, lpcwHeaders, dwHeaderLength, lpvOptional, dwOptionalLength, dwTotalLength, pdwContext);
if ( !bSendRequest )
{
Mess(L"Failed to send the request");
}
else
{
bReceiveResponse = WinHttpReceiveResponse(_hRequest, lpvReserved);
if ( !bReceiveResponse )
{
Mess(L"Unable to receive the response");
}
else
{
Mess(L"Ok");
}
}
}
}
}
if ( hRequest != NULL )
WinHttpCloseHandle(hRequest);
if ( hConnect != NULL )
WinHttpCloseHandle(hConnect);
if ( hHttp != NULL )
WinHttpCloseHandle(hHttp);
return 0;
}
I don't understand WINHTTP much but I'm trying.
When I excute the program, I get
Unable to receive the response
then, I use GetLastError() to get the code of the error that always is 6. I can't find anything about code 6?

Answer 1

Error code 6 is ERROR_INVALID_HANDLE "The handle is invalid."
The problem is that you use wrong variable for the request handle: _hRequest whereas you were to use hRequest instead.
WinHttpReceiveResponse(_hRequest, ...